Commissioning Instructions

7
Siemens Industry, Inc.
A6V11668992
Restricted
2019-03-12
FLO SAT QTY
NumVavSuStrtn (FLO SAT QTY) is a Central Function calculated value object that reports
the number of starved supply air VAV controllers to the PXC/PXCM and is used to control
the AHU. When a Central Function is used to collect this information, the PXC/PXCM can
be set to communicate with the AHU fan controller to increase the static setpoint if
necessary.
The above graphic illustrates the communication of parameters between a Room level
DXR, Central Function DXR, and Primary Plant controller. This type of communication is
common across all Central Functions. The Central Function DXR can act as a bridge
between data from the room and data at the primary plant. By configuring the Room
DXR(s) and Central Function DXR as needed, the saturation function is a very efficient
way to control Static Duct Pressure Reset at the AHU level.